Antiskid device



` E. H. ZIMMER ANTI SKID DEVICE Nov. vsa, 194s.

Filed Nov-` 8. 1946 A T TONEK Patented Nov. 9, 1948 `AN'r'IsKm nevica i i e Eric H. zimmer, Wyckoff, N. J. Application November s, 194e, serial #ossee y 1 i VIn my patent No. 2,429,738 an anti-skid appliancefor application .to an `aut',or`r1obile Wheel is set forth whichincliides a plurality, i. e., at least two,` hook-shaped members to hook over the wheel tread at radially spaced points thereof, means to guide the members, when said applianceis associated with the Wheel, in lines crossing the tread, and means'` to displace said mein-` berfsin the respective directions,` to impingetheir hooks against .the tread." In ,that case thelatter means exerts a pulling force on the members in aixing the appliance to the wheel and itpreferably includes a tensionspring. Further, in the"` Y speoiiicgform set forth, `there being actually three hook-shaped members, a pair of them',` on the one hand,l and the third, on the other, `subject by'said means to movement in therespective directions, the members of said par are con` nected by chains, one inside and the other outside ofthefwheel, forlimiting their movement apart; and to the outer chain said means is releasably coupled fwhen the Vappliance is operatively assembled with the wheel. According` `to the present invention the means for moving `said members to gripping state acts topush themand a compression spring is preferably included.` An;d,instead of securing said means inthe position in which saidmembers are held in gripping relation to the tread byreleasably connecting` it'withione of the chains, said means is lreleasably securedtoone of said members. "The assembly of the present invention is'operative with greater facility andis more eicientand reliable than thatof my said application.`

"In the drawings, f i Fig. 1 shows the appliance in gripping relation -to` thewheel as viewed `axially and from the` uter'wside of thedatter, said appliance andthe wheel, 4which appears in `dotted outline, being.. partly broken away;" 'Y AFigs `2, 3, 4 and `5 are sectional views on` lines 2-4-2, 3-3, 4J-l and 5 5, respectively, of Fig. 1; SFig. Gis a view of the Aappliance as seen from the` left in Figrl, with the appliance'iinretractgd,

state; and

3 Fg. 7` is a view in section` in` the plane`1-1 indicated in Fig. 1. l `As in my aforesaid application, traction elements are provided bythree members I-l-l and 2 `in theform of stiff rods.` Each member has its straight short end portion la in bias relation to its long end portion Ib, whoseiree endisbent out'ofthe plane of the portions Ia-Ib to `form straight, has at 2a one i i hook to hook over the tread. On 'the lowerend of each `member l Aare space `liked collars *or abutments lb. on the upperfendloflmembeg er is an enlargement 3, forming an abutment.

The` means for "moving members- |`I 1an`d2 in the `direction to cause their hooks to` the tread; or reversely, is as followsz and' are two couplingsin thelformof'plates eachpenetrated by all threemembers, coupling` 6 `having a' pair of upstanding lugs `Ba. andfeoupg ling 5 Ia `pair of l depending ings 5d; Linkage connects thesecouplings thusOne pairof links' f thereof is `formed 1at 1a bythe ends of a rebent bar 1 and the other by a pair of links 8, the

two pairs being pivoted together by `a, bolt 9, having a nut 9a and bent .toaccornmodatel member 2, and links 1a` beingpivoted" to lugs" 8a of coupling 6`by `a pin I0, bent around-member 2,` and links 8 being pivoted` to lugsiaby apin illalso bent around member 2. Thebar which said coupling and .abutments`3 isl a compression f aliook' Ic to hookover the wheel tread provided provides links la, being extended" beyond.' them at 1b to provide a handle, actuallyand desirably Since," `as shown, coupling l E" is forms a lever. disposedbetween abutments Ib of eachmember `I the latter will undergo up or downimotionr. therewith, thoughpreferably with slight lost# motion due to the spacing shown of `saidabiitments; -Coupling 5 is slidable up and downthe parallel inner portions la of members In Fig.'

lit is seenin its uppermost position, which posi`` tion it `assumes when the toggle linkage `is straightened. Member 2 is also to undergo mo# tion up or down with-coupling 5,"thou`gh` also with some lost-motion, as will now appear: Between spring l2 penetrated by sais membea'thefcdup ling `having `its downward movement relatively to"`said member limited, through pin i Ilyby a fixed `collar2b `on said member. The linkage consisting of pairs" of links 1a` and 8` `is thusa togglejoint. i. M y A,

When the toggle linkage is moved towarda straightened condition from Iits buckled or collapsedstate (Figr) itforces membersand 6 l apart and thus acts tocollapsethe members |141 j and `2,movin`g members "I-l downwardly and member 2`upwardly so .thattheir hooks will grip the l wheel tread,v with desirable yieldfin` the assembly formed by saidlmembers and the de-y scribed means and due tothe `spring. When the toggle linkage isfreversely movedl'o'r collapsed `after the Slight iostfmotion que te the spacingof the abutmnts has been taken up,` it `causes a positive extensionof` said assembly for-removal engaged from the wheel tread by straightening and collapsing the toggle linkage means, respectively, a compression spring between the toggle linkage means and the second part, whereby the hooks are yieldingly engaged with the wheel tread, means for operating the toggle comprising a lever formed as an extension of one link of the toggle so that it lies close to and generally parallel to the wheel when the toggle is straightened, and means releasably to lock the toggle linkage when in its extended state to the then adjoining portion of one member, said last named means comprising a keeper pivoted to one of the group 10 Number of `parts consisting of the linkage and said meinber and engageable with the other.

ERIC H. ZIMMER.

REFERENCES CITED The following references are of record in the file of this patent:

FOREIGN PATENTS Country Date 1,243,711 Christy et al Oct. 23, 1917 1,941,935 Erickson Jan. 2, 1934 2,174,345 Worthing Sept. 26, 1939 

